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Renaming for clarity

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This commit is contained in:
shannon 2024-12-17 12:55:28 -05:00
parent a5ca642a7f
commit 99fad6fb23
1 changed files with 15 additions and 15 deletions
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30
Mastodon/Scene/HomeTimeline/HomeTimelineViewModel+Diffable.swift
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@ -127,34 +127,34 @@ extension HomeTimelineViewModel {
oldSnapshot: NSDiffableDataSourceSnapshot<S, T>,
newSnapshot: NSDiffableDataSourceSnapshot<S, T>
) -> Difference<T>? {
guard let sourceIndexPath = (tableView.indexPathsForVisibleRows ?? []).sorted().first else { return nil }
let rectForSourceItemCell = tableView.rectForRow(at: sourceIndexPath)
let sourceDistanceToTableViewTopEdge: CGFloat = {
guard let currentFirstVisibleIndexPath = (tableView.indexPathsForVisibleRows ?? []).sorted().first else { return nil }
let rectForCurrentFirstVisibleCell = tableView.rectForRow(at: currentFirstVisibleIndexPath)
let currentDistanceFromFirstVisibleCellToTableViewTopEdge: CGFloat = {
if tableView.window != nil {
return tableView.convert(rectForSourceItemCell, to: nil).origin.y - tableView.safeAreaInsets.top
return tableView.convert(rectForCurrentFirstVisibleCell, to: nil).origin.y - tableView.safeAreaInsets.top
} else {
return rectForSourceItemCell.origin.y - tableView.contentOffset.y - tableView.safeAreaInsets.top
return rectForCurrentFirstVisibleCell.origin.y - tableView.contentOffset.y - tableView.safeAreaInsets.top
}
}()
guard sourceIndexPath.section < oldSnapshot.numberOfSections,
sourceIndexPath.row < oldSnapshot.numberOfItems(inSection: oldSnapshot.sectionIdentifiers[sourceIndexPath.section])
else { return nil }
guard currentFirstVisibleIndexPath.section < oldSnapshot.numberOfSections,
currentFirstVisibleIndexPath.row < oldSnapshot.numberOfItems(inSection: oldSnapshot.sectionIdentifiers[currentFirstVisibleIndexPath.section])
else { assertionFailure("tableview not in sync with oldSnapshot"); return nil }
let sectionIdentifier = oldSnapshot.sectionIdentifiers[sourceIndexPath.section]
let item = oldSnapshot.itemIdentifiers(inSection: sectionIdentifier)[sourceIndexPath.row]
let currentFirstVisibleSectionIdentifier = oldSnapshot.sectionIdentifiers[currentFirstVisibleIndexPath.section]
let currentFirstVisibleItem = oldSnapshot.itemIdentifiers(inSection: currentFirstVisibleSectionIdentifier)[currentFirstVisibleIndexPath.row]
guard let targetIndexPathRow = newSnapshot.indexOfItem(item),
let newSectionIdentifier = newSnapshot.sectionIdentifier(containingItem: item),
guard let targetIndexPathRow = newSnapshot.indexOfItem(currentFirstVisibleItem),
let newSectionIdentifier = newSnapshot.sectionIdentifier(containingItem: currentFirstVisibleItem),
let targetIndexPathSection = newSnapshot.indexOfSection(newSectionIdentifier)
else { return nil }
let targetIndexPath = IndexPath(row: targetIndexPathRow, section: targetIndexPathSection)
return Difference(
item: item,
sourceIndexPath: sourceIndexPath,
sourceDistanceToTableViewTopEdge: sourceDistanceToTableViewTopEdge,
item: currentFirstVisibleItem,
sourceIndexPath: currentFirstVisibleIndexPath,
sourceDistanceToTableViewTopEdge: currentDistanceFromFirstVisibleCellToTableViewTopEdge,
targetIndexPath: targetIndexPath
)
}